If G is a countable group containing a copy of F2 then the conjugacy equivalence relation on subgroups of G attains the maximal possible complexity.
CITATION STYLE
Andretta, A., Camerlo, R., & Hjorth, G. (2001). Conjugacy equivalence relation on subgroups. Fundamenta Mathematicae, 167(3), 189–212. https://doi.org/10.4064/fm167-3-1
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